McGraw-Hill Science, 2002Activity worksheets (graphic organizers, fill-in exercises, etc.) that can be downloaded for the matching K - 6 textbook.(When you visit the link, if you come to a username and password box, type in "technology" for both).

Thunderbolt Kids: Features grades 4 - 6 science and technology lessons that can be viewed online, or you can download here the books (which match the online material and include questions and activities), the teachers' guides (which contain answer keys and teacher notes, and corresponding science adventure comic books.